A water replenishing device for train automatic cleaning machine centrifugal pump using circulating water instead of fresh water

Abstract

The utility model relates to a kind of for train automatic cleaning machine centrifugal pump with circulating water instead of water replenishing device of water, it includes PLC module, intermediate relay, liquid level sensor, solenoid valve, plastic bucket, elbow, three-way valve, water pipe.PLC module is used to receive liquid level sensor signal and control relay, intermediate relay is used to control solenoid valve, solenoid valve is used to control the on-off of water pipe, plastic bucket is used to store the circulating water of supplementary pump before water storage tank, elbow, three-way valve and water pipe are used to connect new system and original system.The principle implemented by the device is that plastic bucket is installed higher than water storage tank by support, 4 liquid level sensors are installed on the outside of plastic bucket, and are labeled as No.1-4 from bottom to top.When the liquid level in the bucket is lower than No.3, the device stops supplementing circulating water to No.4.If the device cannot supplement circulating water due to failure, when the liquid level in the bucket is lower than No.1, the device stops supplementing water to No.2.Occupancy overflow pipe is provided to cope with the situation that cannot stop water supplementing.

Description

Technical Field

[0001] This utility model relates to a water supply system for an automatic cleaning machine for rail transit trains, specifically a water replenishment device for the centrifugal pump of the automatic cleaning machine. Background Technology

[0002] The automatic train washing machine uses two main types of water: filtered circulating water and clean water. Circulating water is primarily used for pre-wetting and applying detergent to the electric train body, while clean water is mainly used for rinsing. A centrifugal pump provides the system water pressure for the washing process. Because the centrifugal pump needs to be filled with water before starting, a water storage tank is installed between the centrifugal pump and the water tank. During the operation of the centrifugal pump, the storage tank is continuously replenished with clean water to ensure normal startup every time. In response to national requirements for energy conservation, emission reduction, cost reduction, and efficiency improvement, and to reduce water waste, a device has been invented to replace clean water with circulating water in replenishing the water storage tank before the centrifugal pump. This device mainly improves the utilization rate of circulating water in the automatic train washing machine, reduces the use of clean water, saves water resources, and lowers operating costs. Summary of the Invention

[0003] This invention provides a device for replenishing the water storage tank in front of the centrifugal pump with circulating water to improve the utilization rate of circulating water in automatic train cleaning machines and reduce the consumption of clean water.

[0004] To achieve the purpose of this invention, the technical solution adopted by this utility model is as follows:

[0005] A water replenishment device for replacing clean water with circulating water in the centrifugal pump of an automatic train cleaning machine is disclosed. The device comprises a PLC control module, an intermediate relay, level sensors, a solenoid valve, a plastic bucket, an elbow, a three-way valve, and water pipes. The PLC control module receives signals from the level sensors and controls the intermediate relay. The intermediate relay controls the solenoid valve, which controls the flow of the water pipes. The plastic bucket stores the circulating water replenished to the storage tank. The elbow, three-way valve, and water pipes connect the new system to the existing system. Four level sensors, numbered 1-4 from bottom to top, are installed on the outside of the plastic bucket to sense the liquid level inside. When the liquid level in the plastic bucket falls below level sensor number 3, the PLC controls the circulating water replenishment solenoid valve to open and replenish circulating water until level sensor number 4 is reached, at which point the replenishment stops. If the device malfunctions and cannot replenish circulating water, when the liquid level in the plastic bucket falls below level sensor number 1, the PLC controls the clean water replenishment solenoid valve to open and replenish clean water until level sensor number 2 is reached, at which point the replenishment stops.

[0006] The PLC control module is model S7-200, the liquid level sensor is model XKC-Y28-24V-NC normally closed, the solenoid valve is model DN15 / 4-point / AC220V, the intermediate relay is model MY2N-GS 24VDC, the plastic bucket is model 50L round bucket, the water pipe is stainless steel 4-point pipe, the three-way valve is a 4-point internal thread three-way valve, and the elbow is a 4-point internal thread elbow. Attached Figure Description

[0007] Figure 1 This is the control logic schematic diagram of this utility model;

[0008] Figure 2 This is the original water supply layout diagram of the centrifugal pump for the automatic train cleaning machine;

[0009] Figure 3 This is a schematic diagram of the main structural layout of this utility model; Detailed Implementation

[0010] The technical solution of the invention will be described in detail below with reference to the accompanying drawings:

[0011] The original water supply method of the centrifugal pump of the automatic train cleaning machine is as follows: Figure 2 As shown, the main components include a water storage tank, a solenoid valve, a centrifugal pump, and water pipes. Its implementation feature is that when the centrifugal pump is working, the normally open solenoid valve is energized to replenish clean water to the water storage tank.

[0012] A water replenishment device for using circulating water instead of clean water in the centrifugal pump of an automatic train cleaning machine, such as... Figure 1 The diagram shown illustrates the control logic of this invention. The main components include a liquid level sensor, a PLC control module, an intermediate relay, and a solenoid valve. Its key feature is that four liquid level sensors, numbered 1-4 from bottom to top, are installed on the outside of the plastic bucket. When the liquid level in the bucket is lower than that of liquid level sensor number 3, the PLC receives a signal and controls intermediate relay 2. The normally open contact of intermediate relay 2 closes, activating the circulating water solenoid valve (solenoid valve 2) to replenish circulating water until it stops at liquid level sensor number 4. If the device malfunctions and cannot replenish circulating water, when the liquid level in the bucket is lower than that of liquid level sensor number 1, the PLC receives a signal and controls intermediate relay 1. The normally open contact of intermediate relay 1 closes, activating the clean water solenoid valve (solenoid valve 1) to replenish clean water until it stops at liquid level sensor number 2.

[0013] For example Figure 3The diagram shows the main structural layout of this utility model, which includes a PLC control module, an intermediate relay, a liquid level sensor, a solenoid valve, a plastic bucket, an elbow, a three-way valve, and a water pipe. Its key features are: the plastic bucket is installed above the water storage tank via a bracket, and its outlet is connected to the water storage tank via a water pipe. The plastic bucket's inlet pipe is connected to the centrifugal pump's downstream water pipe via a three-way valve. Four liquid level sensors, numbered 1-4 from bottom to top, are installed on the outside of the plastic bucket. When the liquid level in the bucket is lower than level sensor number 3, the PLC controls the solenoid valve to open and replenish circulating water until level sensor number 4 is reached, at which point the replenishment stops. If the device malfunctions and cannot replenish circulating water, when the liquid level in the plastic bucket is lower than level sensor number 1, the PLC controls the solenoid valve to open and replenish clean water until level sensor number 2 is reached, at which point the replenishment stops. If the device malfunctions and cannot stop replenishing water, an overflow port is provided above level sensor number 4 on the plastic bucket, and the water in the plastic bucket is drained to the circulating water pool via a water pipe.

Claims

1. A water replenishing device for a train automatic cleaning machine centrifugal pump using circulating water instead of clean water, comprising a PLC control module, an intermediate relay, a liquid level sensor, a solenoid valve, a plastic bucket, an elbow, a tee valve, and a water pipe; characterized in that The plastic bucket is installed higher than the water storage tank, and its outlet is connected to the tank via a water pipe. The bucket's inlet pipe is connected to the centrifugal pump's outlet pipe via a three-way valve. Four level sensors, numbered 1-4 from bottom to top, are installed on the outside of the bucket. The system's logic is as follows: When the water level in the bucket is lower than level sensor 3, the PLC controls the circulating water solenoid valve to open and replenish circulating water until level sensor 4 is reached, at which point the system stops. If the system malfunctions and cannot replenish circulating water, when the water level in the bucket is lower than level sensor 1, the PLC controls the clean water solenoid valve to open and replenish clean water until level sensor 2 is reached, at which point the system stops. If the system malfunctions and cannot stop replenishing water, an overflow port is installed above level sensor 4, draining the water from the bucket into the circulating water pool via a water pipe. This system reduces clean water usage, conserves water resources, and lowers operating costs by using circulating water instead of clean water to replenish the storage tank.

2. The water replenishing device for the centrifugal pump of the train automatic washing machine according to claim 1, characterized in that The device's inlet pipe is connected to the water pipe after the centrifugal pump via a three-way valve, and the outlet is connected to the water storage tank via a water pipe, replenishing the water storage tank by replacing clean water with circulating water.

3. The water replenishing device for the centrifugal pump of the train automatic washing machine according to claim 1, characterized in that The four liquid level sensors, numbered 1-4 from bottom to top, are installed on the outside of the plastic bucket and are used to detect the liquid level inside the bucket. When the liquid level in the plastic bucket is lower than that of liquid level sensor 3, the PLC control module controls the opening of the circulating water solenoid valve to replenish circulating water into the plastic bucket until the liquid level reaches that of liquid level sensor 4, at which point replenishment stops. When the device malfunctions and cannot replenish circulating water, and the liquid level in the plastic bucket is lower than that of liquid level sensor 1, the PLC control module controls the opening of the clean water solenoid valve to replenish clean water into the plastic bucket until the liquid level reaches that of liquid level sensor 2, at which point replenishment stops. When the device malfunctions and cannot stop replenishing water, and the liquid level in the plastic bucket is higher than that of liquid level sensor 4, the water in the plastic bucket can be drained into the circulating water tank through the overflow port.

4. The water replenishing device for the centrifugal pump of the train automatic washing machine according to claim 1, characterized in that The PLC control module monitors the liquid level in the plastic bucket in real time through the signal from the liquid level sensor, and controls the opening and stopping of the circulating water solenoid valve and the clean water solenoid valve according to the set logic.

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